<template>
  <div>
    <button id="button" class="ready" onclick="clickButton();">
      <div class="message submitMessage">
        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 13 12.2">
          <polyline stroke="currentColor" points="2,7.1 6.5,11.1 11,7.1 " />
          <line stroke="currentColor" x1="6.5" y1="1.2" x2="6.5" y2="10.3" />
        </svg>
        <span class="button-text">Submit</span>
      </div>

      <div class="message loadingMessage">
        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 19 17">
          <circle class="loadingCircle" cx="2.2" cy="10" r="1.6" />
          <circle class="loadingCircle" cx="9.5" cy="10" r="1.6" />
          <circle class="loadingCircle" cx="16.8" cy="10" r="1.6" />
        </svg>
      </div>

      <div class="message successMessage">
        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 13 11">
          <polyline stroke="currentColor" points="1.4,5.8 5.1,9.5 11.6,2.1 " />
        </svg>
        <span class="button-text">Success</span>
      </div>
    </button>

    <canvas id="canvas"></canvas>

    <!-- Website Corner Link -->
    <a
      class="website-link"
      href="https://codepen.io/coopergoeke"
      target="_blank"
      rel="noopener noreferrer"
    >
      <svg class="website-link__icon" viewBox="0 0 936.86 1054.94">
        <circle
          cx="468.43"
          cy="607.07"
          r="395.02"
          fill="#fff"
          stroke="#8aa8c5"
          stroke-width="55"
          stroke-miterlimit="10"
        />
        <path
          d="M235.76 936.24l9.7-135.08c3.7-53.1 43.2-96.01 96.01-93.96h250.85c52.81-2.05 92.33 41.65 96.01 93.96l10.73 135.81s-98.94 65.12-231.06 65.12-232.24-65.85-232.24-65.85z"
          fill="#293b67"
        />
        <circle
          cx="468.43"
          cy="607.07"
          r="395.02"
          fill="none"
          stroke="#8aa8c5"
          stroke-width="55"
          stroke-miterlimit="10"
        />
        <path
          d="M532.23 716.09c0 23.61-35.44 30-64.23 30s-64.23-8.39-64.23-30V607.76h128.46v108.33z"
          fill="#e2cfbb"
        />
        <path
          d="M532.23 678.63s-35.44 8.46-64.23 8.46-64.23-7.83-64.23-7.83v-130.5h128.46v129.87z"
          fill="#d3c2b2"
        />
        <path
          d="M722.57 326.26c0 193.67-79.11 350.67-255.53 350.67s-253.25-157-253.25-350.67 156.76-210.31 253.25-210.31c126.23 0 255.53 16.64 255.53 210.31z"
          fill="#ffe8cc"
        />
        <path
          d="M604.47 634.6c-11.18 8.23-23.2 15.37-36.06 21.33-29.33 13.58-63.06 20.99-101.38 20.99-31.91 0-60.57-5.14-86.1-14.7-50.16-18.78-88.26-54.66-115.33-102.22-35.3-62.04-51.82-143.95-51.82-233.74 0-83.76 29.32-134.41 70.41-164.91-90.46 362.86 101.1 570.06 320.28 473.25z"
          fill="#f3ddc3"
        />
        <path
          d="M701.59 182.44c-6.72-15.99-8.89-39.53-18.6-51.9-1.69-2.16-6.62-3.91-12.43-5.52-15.99-16.61-43.59-39.48-65.94-49.1-7.45-3.21-49.94-38.95-58.11-41.45-6.06-1.85-3.35 25.38-19.3 18.59-31.38-13.36-71.2-32.91-85.46-34.43-17.17-1.84 6.77 41.39-12.69 41.39-36.11 0-65.27-23.14-82.97-25.55-1.48 22.91-9.35 37.78-24.01 44.8-12.97 6.21-42.51.74-53.19 9.43 8.93 20.86-.31 22.93-1.87 37.18-7.32 3.08-17.47 5.36-17.47 5.36-11.17 13.67-10.86 35.77-18.24 54.03-7.44 18.42-12.96 39.27-16.63 62.75-3.65 23.39-3.52 72.17-3.52 101 0 96.83 56.25-132.84 91.88-160.87 35.63-28.02 164-32.7 164-32.7S620 163.71 648.95 193.9c28.95 30.18 75.9 249.36 75.9 160.96 0-59.25-7.63-135.22-23.26-172.42z"
          fill="#f2cf6f"
        />
        <path
          d="M441.75 18.63c-15.02-1.61 1.38 31.23-7.26 39.53 15.28-3.58 10.26-39.58 7.26-39.53z"
          fill="#d8b45c"
        />
        <path
          d="M346.09 34.47c-1.48 22.91-12.06 43.85-33.99 47.54 12.81-1.1 21.29 3.03 34.75-2.18 17.45-6.76 16.94-42.95-.76-45.36z"
          fill="#d8b45c"
        />
        <path
          d="M268.89 88.7c8.93 20.86-.31 22.93-1.87 37.18-7.32 3.08-17.47 5.36-17.47 5.36-11.17 13.67-10.86 35.77-18.24 54.03-7.44 18.42-12.96 39.27-16.63 62.75-3.65 23.39 15.73-33.35 48.77-64.39 32.36-30.39 16.12-103.62 5.44-94.93z"
          fill="#d8b45c"
        />
        <path
          d="M505.31 460.4c0-10.8-16.63-19.55-37.14-19.55s-37.14 8.75-37.14 19.55 74.28 10.79 74.28 0z"
          fill="#d3bfae"
        />
        <path
          d="M330.65 366.32c28.67-30.62 53.86-31.06 82.1 0"
          fill="none"
          stroke="#000"
          stroke-width="14"
          stroke-linecap="round"
          stroke-miterlimit="10"
        />
        <path
          d="M521.65 366.32c28.67-30.62 53.86-31.06 82.1 0"
          fill="none"
          stroke="#000"
          stroke-width="14"
          stroke-linecap="round"
          stroke-miterlimit="10"
        />
        <path
          d="M468.01 617.93c-35.42 0-71.93-28.05-71.93-55.82 0-12.56 10.52-18.84 23.38-18.84h97.43c12.86 0 23.38 6.31 23.38 18.84 0 30.2-36.84 55.82-72.26 55.82z"
          fill="#824446"
        />
        <defs>
          <path
            id="a"
            d="M468.01 617.93c-35.42 0-71.93-28.05-71.93-55.82 0-12.56 10.52-18.84 23.38-18.84h97.43c12.86 0 23.38 6.31 23.38 18.84 0 30.2-36.84 55.82-72.26 55.82z"
          />
        </defs>
        <clipPath id="b">
          <use xlink:href="#a" overflow="visible" />
        </clipPath>
        <circle
          cx="468.17"
          cy="614.05"
          r="30"
          clip-path="url(#b)"
          fill="#f37879"
        />
      </svg>
      <span class="website-link__name"
        >Cooper <span class="website-link__last-name">Goeke</span></span
      >
      <span class="website-link__message">Check out more of my work</span>
    </a>
  </div>
</template>
<script>
export default {
  data() {
    return {};
  },
  created() {
    this.init();
  },
  computed: {},
  methods: {
    init() {
      // ammount to add on each button press
      const confettiCount = 20;
      const sequinCount = 10;

      // "physics" variables
      const gravityConfetti = 0.3;
      const gravitySequins = 0.55;
      const dragConfetti = 0.075;
      const dragSequins = 0.02;
      const terminalVelocity = 3;

      // init other global elements
      const button = document.getElementById("button");
      var disabled = false;
      const canvas = document.getElementById("canvas");
      const ctx = canvas.getContext("2d");
      canvas.width = window.innerWidth;
      canvas.height = window.innerHeight;
      let cx = ctx.canvas.width / 2;
      let cy = ctx.canvas.height / 2;

      // add Confetto/Sequin objects to arrays to draw them
      let confetti = [];
      let sequins = [];

      // colors, back side is darker for confetti flipping
      const colors = [
        { front: "#7b5cff", back: "#6245e0" }, // Purple
        { front: "#b3c7ff", back: "#8fa5e5" }, // Light Blue
        { front: "#5c86ff", back: "#345dd1" }, // Darker Blue
      ];

      // helper function to pick a random number within a range
      randomRange = (min, max) => Math.random() * (max - min) + min;

      // helper function to get initial velocities for confetti
      // this weighted spread helps the confetti look more realistic
      initConfettoVelocity = (xRange, yRange) => {
        const x = randomRange(xRange[0], xRange[1]);
        const range = yRange[1] - yRange[0] + 1;
        let y =
          yRange[1] -
          Math.abs(randomRange(0, range) + randomRange(0, range) - range);
        if (y >= yRange[1] - 1) {
          // Occasional confetto goes higher than the max
          y += Math.random() < 0.25 ? randomRange(1, 3) : 0;
        }
        return { x: x, y: -y };
      };

      // Confetto Class
      function Confetto() {
        this.randomModifier = randomRange(0, 99);
        this.color = colors[Math.floor(randomRange(0, colors.length))];
        this.dimensions = {
          x: randomRange(5, 9),
          y: randomRange(8, 15),
        };
        this.position = {
          x: randomRange(
            canvas.width / 2 - button.offsetWidth / 4,
            canvas.width / 2 + button.offsetWidth / 4
          ),
          y: randomRange(
            canvas.height / 2 + button.offsetHeight / 2 + 8,
            canvas.height / 2 + 1.5 * button.offsetHeight - 8
          ),
        };
        this.rotation = randomRange(0, 2 * Math.PI);
        this.scale = {
          x: 1,
          y: 1,
        };
        this.velocity = initConfettoVelocity([-9, 9], [6, 11]);
      }
      Confetto.prototype.update = function () {
        // apply forces to velocity
        this.velocity.x -= this.velocity.x * dragConfetti;
        this.velocity.y = Math.min(
          this.velocity.y + gravityConfetti,
          terminalVelocity
        );
        this.velocity.x += Math.random() > 0.5 ? Math.random() : -Math.random();

        // set position
        this.position.x += this.velocity.x;
        this.position.y += this.velocity.y;

        // spin confetto by scaling y and set the color, .09 just slows cosine frequency
        this.scale.y = Math.cos((this.position.y + this.randomModifier) * 0.09);
      };

      // Sequin Class
      function Sequin() {
        (this.color = colors[Math.floor(randomRange(0, colors.length))].back),
          (this.radius = randomRange(1, 2)),
          (this.position = {
            x: randomRange(
              canvas.width / 2 - button.offsetWidth / 3,
              canvas.width / 2 + button.offsetWidth / 3
            ),
            y: randomRange(
              canvas.height / 2 + button.offsetHeight / 2 + 8,
              canvas.height / 2 + 1.5 * button.offsetHeight - 8
            ),
          }),
          (this.velocity = {
            x: randomRange(-6, 6),
            y: randomRange(-8, -12),
          });
      }
      Sequin.prototype.update = function () {
        // apply forces to velocity
        this.velocity.x -= this.velocity.x * dragSequins;
        this.velocity.y = this.velocity.y + gravitySequins;

        // set position
        this.position.x += this.velocity.x;
        this.position.y += this.velocity.y;
      };

      // add elements to arrays to be drawn
      initBurst = () => {
        for (let i = 0; i < confettiCount; i++) {
          confetti.push(new Confetto());
        }
        for (let i = 0; i < sequinCount; i++) {
          sequins.push(new Sequin());
        }
      };

      // draws the elements on the canvas
      render = () => {
        ctx.clearRect(0, 0, canvas.width, canvas.height);

        confetti.forEach((confetto, index) => {
          let width = confetto.dimensions.x * confetto.scale.x;
          let height = confetto.dimensions.y * confetto.scale.y;

          // move canvas to position and rotate
          ctx.translate(confetto.position.x, confetto.position.y);
          ctx.rotate(confetto.rotation);

          // update confetto "physics" values
          confetto.update();

          // get front or back fill color
          ctx.fillStyle =
            confetto.scale.y > 0 ? confetto.color.front : confetto.color.back;

          // draw confetto
          ctx.fillRect(-width / 2, -height / 2, width, height);

          // reset transform matrix
          ctx.setTransform(1, 0, 0, 1, 0, 0);

          // clear rectangle where button cuts off
          if (confetto.velocity.y < 0) {
            ctx.clearRect(
              canvas.width / 2 - button.offsetWidth / 2,
              canvas.height / 2 + button.offsetHeight / 2,
              button.offsetWidth,
              button.offsetHeight
            );
          }
        });

        sequins.forEach((sequin, index) => {
          // move canvas to position
          ctx.translate(sequin.position.x, sequin.position.y);

          // update sequin "physics" values
          sequin.update();

          // set the color
          ctx.fillStyle = sequin.color;

          // draw sequin
          ctx.beginPath();
          ctx.arc(0, 0, sequin.radius, 0, 2 * Math.PI);
          ctx.fill();

          // reset transform matrix
          ctx.setTransform(1, 0, 0, 1, 0, 0);

          // clear rectangle where button cuts off
          if (sequin.velocity.y < 0) {
            ctx.clearRect(
              canvas.width / 2 - button.offsetWidth / 2,
              canvas.height / 2 + button.offsetHeight / 2,
              button.offsetWidth,
              button.offsetHeight
            );
          }
        });

        // remove confetti and sequins that fall off the screen
        // must be done in seperate loops to avoid noticeable flickering
        confetti.forEach((confetto, index) => {
          if (confetto.position.y >= canvas.height) confetti.splice(index, 1);
        });
        sequins.forEach((sequin, index) => {
          if (sequin.position.y >= canvas.height) sequins.splice(index, 1);
        });

        window.requestAnimationFrame(render);
      };

      // cycle through button states when clicked
      clickButton = () => {
        if (!disabled) {
          disabled = true;
          // Loading stage
          button.classList.add("loading");
          button.classList.remove("ready");
          setTimeout(() => {
            // Completed stage
            button.classList.add("complete");
            button.classList.remove("loading");
            setTimeout(() => {
              window.initBurst();
              setTimeout(() => {
                // Reset button so user can select it again
                disabled = false;
                button.classList.add("ready");
                button.classList.remove("complete");
              }, 4000);
            }, 320);
          }, 1800);
        }
      };

      // re-init canvas if the window size changes
      resizeCanvas = () => {
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;
        cx = ctx.canvas.width / 2;
        cy = ctx.canvas.height / 2;
      };

      // resize listenter
      window.addEventListener("resize", () => {
        resizeCanvas();
      });

      // click button on spacebar or return keypress
      document.body.onkeyup = (e) => {
        if (e.keyCode == 13 || e.keyCode == 32) {
          clickButton();
        }
      };

      // Set up button text transition timings on page load
      textElements = button.querySelectorAll(".button-text");
      textElements.forEach((element) => {
        characters = element.innerText.split("");
        let characterHTML = "";
        characters.forEach((letter, index) => {
          characterHTML += `<span class="char${index}" style="--d:${
            index * 30
          }ms; --dr:${
            (characters.length - index - 1) * 30
          }ms;">${letter}</span>`;
        });
        element.innerHTML = characterHTML;
      });

      // kick off the render loop
      window.initBurst();
      render();
    },
  },
};
</script>
<style scoped>
@keyframes loading {
  0% {
    cy: 10;
  }
  25% {
    cy: 3;
  }
  50% {
    cy: 10;
  }
}
body {
  -webkit-font-smoothing: antialiased;
  background-color: #f4f7ff;
}

canvas {
  height: 100vh;
  pointer-events: none;
  position: fixed;
  width: 100%;
  z-index: 2;
}

button {
  background: none;
  border: none;
  color: #f4f7ff;
  cursor: pointer;
  font-family: "Quicksand", sans-serif;
  font-size: 14px;
  font-weight: 500;
  height: 40px;
  left: 50%;
  outline: none;
  overflow: hidden;
  padding: 0 10px;
  position: fixed;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 190px;
  -webkit-tap-highlight-color: transparent;
  z-index: 1;
}
button::before {
  background: #1f2335;
  border-radius: 50px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4) inset;
  content: "";
  display: block;
  height: 100%;
  margin: 0 auto;
  position: relative;
  transition: width 0.2s cubic-bezier(0.39, 1.86, 0.64, 1) 0.3s;
  width: 100%;
}

button.ready .submitMessage svg {
  opacity: 1;
  top: 1px;
  transition: top 0.4s ease 600ms, opacity 0.3s linear 600ms;
}
button.ready .submitMessage .button-text span {
  top: 0;
  opacity: 1;
  transition: all 0.2s ease calc(var(--dr) + 600ms);
}

button.loading::before {
  transition: width 0.3s ease;
  width: 80%;
}
button.loading .loadingMessage {
  opacity: 1;
}
button.loading .loadingCircle {
  animation-duration: 1s;
  animation-iteration-count: infinite;
  animation-name: loading;
  cy: 10;
}

button.complete .submitMessage svg {
  top: -30px;
  transition: none;
}
button.complete .submitMessage .button-text span {
  top: -8px;
  transition: none;
}
button.complete .loadingMessage {
  top: 80px;
}
button.complete .successMessage .button-text span {
  left: 0;
  opacity: 1;
  transition: all 0.2s ease calc(var(--d) + 1000ms);
}
button.complete .successMessage svg {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.3s ease-in-out 1.4s;
}

.button-text span {
  opacity: 0;
  position: relative;
}

.message {
  left: 50%;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
}

.message svg {
  display: inline-block;
  fill: none;
  margin-right: 5px;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.submitMessage .button-text span {
  top: 8px;
  transition: all 0.2s ease var(--d);
}
.submitMessage svg {
  color: #5c86ff;
  margin-left: -1px;
  opacity: 0;
  position: relative;
  top: 30px;
  transition: top 0.4s ease, opacity 0.3s linear;
  width: 14px;
}

.loadingMessage {
  opacity: 0;
  transition: opacity 0.3s linear 0.3s,
    top 0.4s cubic-bezier(0.22, 0, 0.41, -0.57);
}
.loadingMessage svg {
  fill: #5c86ff;
  margin: 0;
  width: 22px;
}

.successMessage .button-text span {
  left: 5px;
  transition: all 0.2s ease var(--dr);
}
.successMessage svg {
  color: #5cffa1;
  stroke-dasharray: 20;
  stroke-dashoffset: 20;
  transition: stroke-dashoffset 0.3s ease-in-out;
  width: 14px;
}

.loadingCircle:nth-child(2) {
  animation-delay: 0.1s;
}

.loadingCircle:nth-child(3) {
  animation-delay: 0.2s;
}

/* Website Link */
.website-link {
  background: #f8faff;
  border-radius: 50px 0 0 50px;
  bottom: 30px;
  color: #324b77;
  cursor: pointer;
  font-family: "Montserrat", sans-serif;
  font-weight: 600;
  height: 34px;
  filter: drop-shadow(2px 3px 4px rgba(0, 0, 0, 0.1));
  padding: 0 20px 0 40px;
  position: fixed;
  right: 0;
  text-align: left;
  text-decoration: none;
}
.website-link__icon {
  left: -10px;
  position: absolute;
  top: -12px;
  width: 44px;
}
.website-link__name {
  display: block;
  font-size: 14px;
  line-height: 14px;
  margin: 5px 0 3px;
}
.website-link__last-name {
  color: #55bada;
}
.website-link__message {
  color: #8aa8c5;
  display: block;
  font-size: 7px;
  line-height: 7px;
}
</style>
